/* ==============================================
   10X PROJECT リバイバル - 和モダン新年デザイン
   カラースキーム: 黒・金・白・赤
   ============================================== */

/* ===== リセット & ベース設定 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラー定義 */
    --primary-black: #0a0a0a;
    --secondary-black: #1a1a1a;
    --gold: #d4af37;
    --gold-light: #f4d03f;
    --gold-dark: #b8941f;
    --white: #ffffff;
    --off-white: #f5f5f5;
    --red: #c41e3a;
    --red-dark: #8b1428;
    
    /* フォント */
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif;
    
    /* スペーシング */
    --section-padding: 100px 20px;
    --container-max-width: 1200px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--primary-black);
    color: var(--white);
    line-height: 1.8;
    overflow-x: hidden;
    position: relative;
}

/* ===== 背景装飾 ===== */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(196, 30, 58, 0.06) 0%, transparent 50%),
        linear-gradient(180deg, #0a0a0a 0%, #1a1a1a 100%);
    z-index: -1;
    pointer-events: none;
}

.bg-decoration::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(90deg, rgba(212, 175, 55, 0.03) 0px, transparent 1px, transparent 100px, rgba(212, 175, 55, 0.03) 101px);
    opacity: 0.3;
}

/* ===== コンテナ ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== ファーストビュー ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--section-padding);
    background: linear-gradient(180deg, rgba(10, 10, 10, 0.95) 0%, rgba(26, 26, 26, 0.98) 100%);
}

.new-year-ornament {
    position: absolute;
    top: 40px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    font-size: 3rem;
    opacity: 0.7;
}

.ornament-left, .ornament-right {
    animation: float 3s ease-in-out infinite;
}

.ornament-right {
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

/* メインキャッチコピー */
.main-catch {
    margin-bottom: 50px;
}

.traditional-text {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 50%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.2em;
    margin-bottom: 30px;
    text-shadow: 0 0 30px rgba(212, 175, 55, 0.5);
    animation: shine 3s ease-in-out infinite;
}

@keyframes shine {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.3); }
}

.greeting {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    font-weight: 600;
    color: var(--off-white);
    margin-bottom: 20px;
    letter-spacing: 0.1em;
}

.special-offer {
    display: block;
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.05em;
}

/* プロジェクト名 */
.project-title {
    margin: 60px 0 40px;
    padding: 40px 30px;
    border: 3px solid var(--gold);
    border-radius: 10px;
    background: rgba(212, 175, 55, 0.05);
    box-shadow: 
        0 0 30px rgba(212, 175, 55, 0.3),
        inset 0 0 30px rgba(212, 175, 55, 0.1);
    position: relative;
    overflow: hidden;
}

.project-title::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(212, 175, 55, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.project-name {
    display: block;
    font-family: var(--font-sans);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    letter-spacing: 0.15em;
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 50%, var(--gold-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.project-subtitle {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--red);
    letter-spacing: 0.2em;
    text-shadow: 0 0 20px rgba(196, 30, 58, 0.5);
    position: relative;
    z-index: 1;
}

/* サブキャッチ */
.sub-catch {
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    font-weight: 600;
    line-height: 1.8;
    margin-bottom: 40px;
    color: var(--off-white);
}

.highlight-text {
    color: var(--gold-light);
    font-weight: 700;
    font-size: 1.1em;
    text-shadow: 0 0 15px rgba(244, 208, 63, 0.5);
}

/* 補足テキスト */
.hero-description {
    font-size: clamp(1rem, 2vw, 1.3rem);
    line-height: 2;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 60px;
}

.emphasis {
    color: var(--gold);
    font-weight: 700;
}

.limited {
    color: var(--red);
    font-weight: 700;
    border-bottom: 2px solid var(--red);
}

/* スクロール誘導 */
.scroll-indicator {
    margin-top: 80px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.scroll-text {
    display: block;
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    color: var(--gold);
    margin-bottom: 10px;
}

.scroll-arrow {
    font-size: 2rem;
    color: var(--gold);
}

/* ===== 動画視聴セクション ===== */
.video-section {
    padding: var(--section-padding);
    background: linear-gradient(180deg, rgba(26, 26, 26, 0.98) 0%, rgba(10, 10, 10, 0.95) 100%);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-pre-title {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    color: var(--gold);
    font-weight: 700;
    letter-spacing: 0.1em;
}

.video-wrapper {
    max-width: 900px;
    margin: 0 auto 40px;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: var(--secondary-black);
    border: 3px solid var(--gold);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 50px rgba(212, 175, 55, 0.3);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-description {
    text-align: center;
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    line-height: 2;
    color: var(--off-white);
}

.gold-text {
    color: var(--gold-light);
    font-weight: 700;
    font-size: 1.1em;
}

/* ===== CTAセクション ===== */
.cta-section {
    padding: var(--section-padding);
    background: 
        linear-gradient(135deg, rgba(196, 30, 58, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, rgba(10, 10, 10, 0.95) 0%, rgba(26, 26, 26, 0.98) 100%);
    position: relative;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 30px;
    line-height: 1.5;
}

.project-emphasis {
    color: var(--gold-light);
    border-bottom: 3px solid var(--gold);
    padding-bottom: 5px;
}

.cta-description {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    line-height: 2;
    margin-bottom: 50px;
    color: var(--off-white);
}

.highlight-gold {
    color: var(--gold-light);
    font-weight: 700;
    font-size: 1.1em;
}

/* LINEボタン */
.line-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding: 25px 50px;
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 700;
    color: var(--white);
    background: linear-gradient(135deg, #06c755 0%, #00b140 100%);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 
        0 10px 30px rgba(6, 199, 85, 0.4),
        0 0 0 0 rgba(6, 199, 85, 0.5);
    position: relative;
    overflow: hidden;
}

.line-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.line-button:hover::before {
    width: 400px;
    height: 400px;
}

.line-button:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 15px 40px rgba(6, 199, 85, 0.6),
        0 0 0 8px rgba(6, 199, 85, 0.2);
}

.line-button:active {
    transform: translateY(-2px);
}

.line-icon {
    font-size: 1.5em;
    position: relative;
    z-index: 1;
}

.button-text {
    position: relative;
    z-index: 1;
}

.cta-note {
    margin-top: 20px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== 3大プレゼントセクション ===== */
.present-section {
    padding: var(--section-padding);
    background: 
        radial-gradient(circle at top, rgba(212, 175, 55, 0.08) 0%, transparent 60%),
        linear-gradient(180deg, rgba(26, 26, 26, 0.98) 0%, rgba(10, 10, 10, 0.95) 100%);
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.title-accent {
    display: block;
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--red);
    font-weight: 700;
    letter-spacing: 0.2em;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.title-main {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.5;
}

.present-intro {
    text-align: center;
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    line-height: 2;
    margin-bottom: 60px;
    color: var(--off-white);
}

.bold {
    font-weight: 700;
}

/* プレゼントグリッド */
.present-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.present-card {
    background: linear-gradient(145deg, rgba(26, 26, 26, 0.9) 0%, rgba(10, 10, 10, 0.95) 100%);
    border: 2px solid var(--gold);
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    transition: all 0.4s ease;
    overflow: hidden;
}

.present-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
    transition: left 0.6s ease;
}

.present-card:hover::before {
    left: 100%;
}

.present-card:hover {
    transform: translateY(-10px);
    border-color: var(--gold-light);
    box-shadow: 
        0 20px 50px rgba(212, 175, 55, 0.4),
        0 0 30px rgba(212, 175, 55, 0.2);
}

.present-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 3rem;
    font-weight: 900;
    color: rgba(212, 175, 55, 0.2);
    font-family: var(--font-sans);
}

.present-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.present-card-title {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--gold-light);
    line-height: 1.6;
}

.present-card-description {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 25px;
}

.present-badge {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--red) 0%, var(--red-dark) 100%);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 20px;
    letter-spacing: 0.05em;
}

/* ===== 再CTAセクション ===== */
.final-cta-section {
    padding: var(--section-padding);
    background: 
        radial-gradient(circle at center, rgba(196, 30, 58, 0.15) 0%, transparent 70%),
        linear-gradient(180deg, rgba(10, 10, 10, 0.95) 0%, rgba(0, 0, 0, 1) 100%);
    position: relative;
}

.final-cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.final-cta-title {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 900;
    margin-bottom: 50px;
    background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 50%, var(--red) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.4;
}

.line-button-large {
    padding: 30px 60px;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    margin-bottom: 40px;
}

.final-message {
    margin-top: 50px;
}

.icecube-text {
    display: inline-block;
    font-family: var(--font-serif);
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    font-weight: 700;
    color: var(--gold-light);
    padding: 20px 40px;
    border: 2px solid var(--gold);
    border-radius: 10px;
    background: rgba(212, 175, 55, 0.05);
    letter-spacing: 0.05em;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(212, 175, 55, 0.6);
    }
}

/* ===== フッター ===== */
.footer {
    padding: 40px 20px;
    background: #000000;
    border-top: 1px solid rgba(212, 175, 55, 0.3);
}

.footer-text {
    text-align: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

.project-name-footer {
    color: var(--gold);
    font-weight: 700;
    letter-spacing: 0.1em;
}

/* ===== アニメーション ===== */
.fade-in {
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.present-card[data-delay="0"] {
    transition-delay: 0s;
}

.present-card[data-delay="1"] {
    transition-delay: 0.2s;
}

.present-card[data-delay="2"] {
    transition-delay: 0.4s;
}

/* ===== レスポンシブデザイン ===== */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px 20px;
    }
    
    .sp-only {
        display: inline;
    }
    
    .new-year-ornament {
        font-size: 2rem;
        top: 20px;
    }
    
    .project-title {
        padding: 30px 20px;
        margin: 40px 0 30px;
    }
    
    .present-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .line-button {
        padding: 20px 35px;
        font-size: 1.1rem;
    }
    
    .line-button-large {
        padding: 25px 40px;
        font-size: 1.2rem;
    }
    
    .video-wrapper {
        padding: 0 10px;
    }
}

@media (min-width: 769px) {
    .sp-only {
        display: none;
    }
}

/* ===== スクロールバーのカスタマイズ ===== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--primary-black);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--gold) 0%, var(--gold-dark) 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gold-light);
}